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Aflati x,natural, daca (5x+5)/(10x+6)

Răspuns :

amplificãm cu 10x-6
(5x+5)(10x-6)/(100x^2-36)=(50x^2-30x+50x-30)/(100x^2-36)=(50x^2+20x-30)/(100x^2-36) doar atat il pot face